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Adjective: wilful  wil-ful
Usage: Brit, Cdn (US: willful)
  1. Done by design
    "wilful disobedience";
    - willful [N. Amer]
  2. Habitually disposed to disobedience and opposition
    "The relationship between the intellect and the emotions is like the relationship between parents and their wilful five-year-old";
    - froward [archaic], headstrong, self-willed, willful [N. Amer]

See also: disobedient, voluntary